Drillable plug
AssigneeSchlumberger Technology Corporation
InventorsGeorge J. Melenyzer, Christopher Cromer
Life of this patent
Estimating the term…
Abstract
A drillable plug includes a mandrel having an upper end and a lower axial section, the lower axial section having a geometry transition point separating an upper circular mandrel profile from a lower non-circular mandrel profile, a seal element disposed around the upper circular mandrel profile, and a lower cone having an inner surface forming a passage, the lower cone disposed around the lower non-circular mandrel profile whereby the lower cone is rotationally locked with the mandrel and a lower slip assembly moveably disposed on a sloped outer surface of the lower cone.
Claims20
A drillable plug, comprising:
- a mandrel having a top end and a lower axial section, wherein the lower axial section comprises a geometry transition point separating an upper circular mandrel profile from a lower non-circular mandrel profile;
- a seal element disposed around the upper circular mandrel profile;
- a lower cone having an inner surface forming a passage, the lower cone disposed around the lower non-circular mandrel profile whereby the lower cone is rotationally locked with the mandrel;
- and
- a lower slip assembly moveably disposed on a sloped outer surface of the lower cone.
A method, comprising:
- milling or drilling through a drillable plug that is set in a wellbore, the drillable plug comprising:
- a mandrel having a top end and a lower axial section, wherein the lower axial section comprises a geometry transition point separating an upper circular mandrel profile from a lower non-circular mandrel profile;
- an upper gage ring disposed around the mandrel adjacent the top end;
- a seal element disposed around the upper circular mandrel profile;
- an upper cone disposed around the upper circular mandrel profile between the upper gage ring and the seal element;
- an upper slip assembly moveably disposed on a sloped outer surface of the upper cone;
- a lower cone having an inner surface forming a passage, the lower cone disposed around the lower non-circular mandrel profile whereby the lower cone is rotationally locked with the mandrel;
- and
- a lower slip assembly moveably disposed on a sloped outer surface of the lower cone.
A drillable plug, comprising:
- a mandrel having a top end and a lower axial section, wherein the lower axial section comprises a geometry transition point separating an upper circular mandrel profile from a lower non-circular mandrel profile;
- an upper gage ring disposed around the mandrel adjacent the top end;
- a seal element disposed around the upper circular mandrel profile;
- an upper cone disposed around the upper circular mandrel profile between the upper gage ring and the seal element;
- an upper slip assembly moveably disposed on a sloped outer surface of the upper cone that is disposed between opposing side walls;
- a lower cone having an inner surface forming a passage comprising a circular section disposed about the upper circular mandrel profile and a non-circular section disposed around the lower non-circular mandrel profile whereby the lower cone is rotationally locked with the mandrel;
- a lower slip assembly moveably disposed on a sloped outer surface of the lower cone that is disposed between opposing side walls;
- and
- an end ring connected to a lower end of the seal element and comprising an axially extending member disposed in a recess formed in the inner surface of the lower cone.
Dependencies are inferred from the claim text.